Scraping Amazon Adwords Keywords

From what I can see, there are about 2 million keywords that amazon is bidding on (not sure how accurate that is though). I'm wondering what the best way would be to get a list of all those keywords, and perhaps the corresponding url (and perhaps sorted by google traffic).

I've looked into programs like semrush and keywordspy, but it seems like this would be pretty costly and time consuming.

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